Alexander Barkov 3ceb4a54a1 MDEV-16325 CREATE..SELECT..UNION creates a wrong field type for old varchar ...

- Adding Type_handler::traditional_merge_field_type()
- Removing real_type_to_type(), field_merge_type()
- Making Type_handler_var_string to merge as VARCHAR
- Additionally, fixing Field_string::print() to add the "/*old*/"
  comment into the data type for the old VARCHAR.
  This is similar to what MDEV-8267 earlier did for old DECIMAL.
- Adding tests

2018-05-30 15:22:58 +04:00

4.8 KiB

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